По действиям, пожалуйста#927

1. 5/7×(21/20 - 7/30)+ 16/21: 8/7=1 1/4 а. 21/20-7/30=49/60 б. 5/7× 49/60=7/12 в. 16/21: 8/7=2/3 г. 7/12+2/3=15/12= 1 3/12= 1 1/4 2.4/45:(12/25-4/15)+15/16×4/15=2/3 а. (12/25-4/15)=16/75 б. 4/45:16/75=15/36=5/12 в. 15/16×4/15=1/4 г. 5/12+1/4=8/12=2/3 3. 2: 2 2/3+ 1 4/5× 3 1/3 - 2 5/6= 3 11/12 а. 2 : 2 2/3= 6/3:8/3=3/4 б. 1 4/5× 3 1/3= 9/5 ×10/3=6 в. 3/4+6=6 3/4 г. 6 3/4 - 2 5/6= 4 (3/4-5/6)= 3 11/12 4. 3 : 3 3/4 + 2 2/5 × 2 1/2 - 3 5/6=2 29/30 а. 3 :3 3/4= 9/3 : 15/4=36/45=4/5 б. 2 2/5 × 2 1/2=12/5 ×5/2=6 в. 4/5 + 6 =6 4/5 г. 6 4/5 - 3 5/6 = 3 (4/5-5/6)= 2 29/30